linux-kernel - Re: [RFC] dma: passing "attributes" to dma_map

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Message-ID: <adar6hj1zhe.fsf@cisco.com>
Date:	Tue, 18 Dec 2007 13:09:49 -0800
From:	Roland Dreier <rdreier@...co.com>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	akepner@....com, Andrew Morton <akpm@...ux-foundation.org>,
	grundler@...isc-linux.org, jbarnes@...tuousgeek.org, jes@....com,
	randy.dunlap@...cle.com, James.Bottomley@...eleye.com,
	davem@...emloft.net, linux-kernel@...r.kernel.org
Subject: Re: [RFC] dma: passing "attributes" to dma_map_* routines

 > However, your older patch series looks like you want this behavior also
 > in areas which are mapped by dma_map_sg(), do you?.  Still, adding two
 > functions of the kind like above, if necessary, might still be
 > preferable to changing the call parameters of existing functions or to
 > overloading enum dma_data_direction.

Yes, the _sg variants are needed, because we want to map userspace
regions with this attribute and there's of course no guarantee that
userspace memory is contiguous.

 - R.
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